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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Significant accounting policies |
Schedule of depreciation and estimated useful lives of property, plant and equipment |
Asset |  | Estimated useful life (in years)
Buildings received from ENTel |  | 35
Buildings acquired subsequent to 11/8/90 |  | 50
Improvements in third parties buildings |  | 2 – 5
Tower and pole |  | 10 – 20
Transmission equipment |  | 3 – 20
Wireless network access |  | 3 – 7
Switching equipment |  | 5 – 7
Power equipment |  | 7 – 15
External wiring |  | 3 – 20
Computer equipment and software |  | 3 – 5
Telephony equipment and instruments |  | 5
Installations |  | 2 – 10
Schedule of property, plant and equipment related to financial leases |
|  | Book value |  | Lease term |  | Depreciation
PP&E – Computer equipment |  | 77 |  | 3 years |  | 3 years
Accumulated depreciation |  | (64) |  |  |  |
Net carrying value as of December 31, 2017 |  | 13 |  |  |  |
Schedule of assumptions used in determining expense and benefit obligations |
|  | 2017 |  | 2016 |  | 2015
Discount rate (1) |  | 4.6% - 9.2% |  | 4.8% - 6.2% |  | 6.5% - 8.5%
Projected increase rate in compensation (2) |  | 8.0% - 16.3% |  | 8.0% - 22.5% |  | 12.0% - 26.8%
(1) Represents estimates of real rate of interest rather than nominal rate in $. (2) In line with an estimated inflationary environment for the next three financial years.

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- Definition The disclosure of assets recognised by the entity as a result of engaging in finance leases. [Refer: Recognised finance lease as assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 31 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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- Definition The disclosure of a sensitivity analysis for significant actuarial assumptions used to determine the present value of a defined benefit obligation. [Refer: Actuarial assumptions [member]; Defined benefit obligation, at present value] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 145 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The disclosure of detailed information about depreciation and estimated useful lives of property, plant and equipment. + References No definition available. + Details
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